Cougar - What motors are people running?

[snej]

i´m running a 21,5 T graupner for the german stock class. at the moment with 28/78.

[mikeyscott]

My 8.5 got pretty hot yesterday on a 78/28 I assume I'm under geared then?

[JustARcFan]

My 8.5 is cold with a 78 spur / 26 pinion

Originally Posted by mikeyscott

My 8.5 got pretty hot yesterday on a 78/28 I assume I'm under geared then?

[mikeyscott]

Originally Posted by JustARcFan

My 8.5 is cold with a 78 spur / 26 pinion

Mmm ok odd. Have you cut some holes in the shell at all?

[JustARcFan]

1 big hole at the motor side

[mikeyscott]

Originally Posted by JustARcFan

1 big hole at the motor side

Need to look at doing this then too Get a nice shell and then cut holes in it

[JustARcFan]

If you do it with a body reamer it doesn't look bad at all.

Originally Posted by mikeyscott

Need to look at doing this then too Get a nice shell and then cut holes in it

[mikeyscott]

Originally Posted by JustARcFan

If you do it with a body reamer it doesn't look bad at all.

Yup that's what I'll do

[Aran]

Can't you cut 1mm or 2mm rectangle out and have them like a grille, then heat them up and curve them in a bit.

Simular to how F1 cars used to be. I reckon that would look cool
Like this here

[mdb_75]

Go down to a 26T pinion too, I'd say your 7.2:1 fdr is overgeared. with a 26T you'll be 7.8:1 which should be better for your temps.

Personally though I'd say even that's getting towards overgeared for offroad and would use a 24/25T max unless you have lots of long straights?

[mikeyscott]

Originally Posted by mdb_75

Go down to a 26T pinion too, I'd say your 7.2:1 fdr is overgeared. with a 26T you'll be 7.8:1 which should be better for your temps.

Personally though I'd say even that's getting towards overgeared for offroad and would use a 24/25T max unless you have lots of long straights?

Got a few on the power sections..

http://www.torchracing.org.uk/gallery.php

Tempted to change the gear to what you've suggested, but also try a 7.5 V3 or look at a 12.3 rotor.

[mdb_75]

With a 7.5 you'd have to go to a smaller pinion again.

[mikeyscott]

Originally Posted by mdb_75

With a 7.5 you'd have to go to a smaller pinion again.

Yeah that's not a problem. I have 78 - 83 spurs in my box so can adjust as required

[mdb_75]

That looks a good track Mikey! Plenty of tight twisty bits too! You'll have to find out what gearing others are using with similar motors to yours at your track to see if you're way out or not, but I'd say you need to drop 2 or 3 teeth at least.

[mikeyscott]

Originally Posted by mdb_75

That looks a good track Mikey! Plenty of tight twisty bits too! You'll have to find out what gearing others are using with similar motors to yours at your track to see if you're way out or not, but I'd say you need to drop 2 or 3 teeth at least.

Thanks, it's a bit narrow in places, but we'll be sorting that out.

We had Grant and co down at the weekend for an awesome day.

Wondering if I'm just on the power too much for the motor. I'm not wanting to sell it as I want it for Petit if it's on next year.

Based on the FDR calculations I could also look at 82/25 which will give a 8.53 FDR

[ian h]

Originally Posted by mikeyscott

Thanks, it's a bit narrow in places, but we'll be sorting that out.

We had Grant and co down at the weekend for an awesome day.

Wondering if I'm just on the power too much for the motor. I'm not wanting to sell it as I want it for Petit if it's on next year.

Based on the FDR calculations I could also look at 82/25 which will give a 8.53 FDR

Thats some difference to the 7.2 your running now. I'm running 23/78 on a 7.5 which seems ok on our grass track. I would say that 25/78 would be more like it for the 8.5.

[mikeyscott]

Originally Posted by ian h

Thats some difference to the 7.2 your running now. I'm running 23/78 on a 7.5 which seems ok on our grass track. I would say that 25/78 would be more like it for the 8.5.

I was originally going by the recommend FDR chart on the speed passion manual. I'm crap at guaging FDR

23/78 is 8.82

25/78 is 8.11

I'll get things changed and experimented with this week.

[gazhillAE]

Speed passion V3 6.5t
80t
22

[mikeyscott]

So what FDR would you look for in a 8.5 / 7.5 as you can achieve similar FDR with different spur and pinion combinations etc.

[whjdm069]

does any one know where I can purchase a smaller spur for the cougar?